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in much of the book the term "paradigm" is used in two different senses. On the one hand, it stands for the entire constellations of beliefs, values, techniques, and so on shared by the members of a given community. On the other, it denotes one sort of element in that constellation, the concrete puzzle-solutions which, employed as models or examples, can replace explicit rules as a basis for the solution of the remaining puzzles of normal science.
--Thomas S. Kuhn, "Postscript - 1969" in The Structure Of Scientific Revolutions Second Edition, Enlarged, p. 175.

OK. Start discussing, start posting comments on this, in light of what you read in "What Are Scientific Revolutions?" Except I've got a few points of my own to make, and I've got a specific question in bold, below, if you're wondering where to start.

Minor point: when Kuhn says "employed as models or examples" here, he's treating the words "models" and "examples" as near synonyms, despite his also using the word "model," both later on in this "Postscript" (p. 184) and in the piece "Second Thoughts On Paradigms," in a specific sense as a different element in the constellation - different from "example," that is. I talked about that other use over here, and if you didn't see what I wrote or you want to refresh your memory, you should go look. Not that the words "models" and "examples" are generally synonymous, but in the above passage they modify each other, so that when Kuhn talks about examples he's talking about those examples - which he's now calling "exemplars" - that are used as models (as opposed to examples used as illustrations or for clarification), and by model here he means "an example you try to follow" (rather than, e.g., a useful analogy or simile such as "electric resistance is like the flow of water in pipes," this sort of useful analogy being the other sort of "model" that I've mentioned in the previous two sentences). To confuse things further, in "Second Thoughts on Paradigms," in which he distinguishes between "models" and "exemplars," he uses the verb "model" to say what it is that scientists do with exemplars, and generally throughout his essays when he uses the word "model" in its verb form he's doing exactly this, saying what it is that scientists do with exemplars - e.g., that they model their subsequent puzzle-solutions on paradigms i.e. exemplars, which are concrete puzzle solutions.

Next point: OK, and what's a paradigm in its narrow use as "exemplar"? Well, actually, this is a definition right here. An exemplar is "a concrete puzzle-solution employed as a model or an example." But what about the rest of that sentence?

Crucial point: Kuhn says exemplars "can replace explicit rules." Now this could be confusing. It could be interpreted as saying, "A science can have a set of explicit rules, so a function of an exemplar is to come along and replace some of these rules; therefore, when scientists start employing an exemplar, it replaces their practice of following an explicit rule or rules that they'd formerly employed." But this is very much NOT what Kuhn means. Too bad my time machine is broken, or I'd go back and make him rewrite his sentence. What he actually means is that scientists use exemplars, whereas some philosophers had mistakenly argued that scientists used rules. So what Kuhn is saying is that in understanding what scientists do - how they learn to practice a particular science or subscience, and then how they actually engage in the science - we need to replace the idea that scientists learn and follow rules with the idea that they learn and employ paradigms - "paradigms" in the sense of "exemplars," i.e., concrete puzzle-solutions etc. (What I've just written is a bit simplistic, since Kuhn doesn't actually believe that there are no rules or definitions in science, but rather that some useful rules of thumb come along after you've learned to use the paradigms, and that paradigms are the basic means with which scientists make sense of their definitions.)

This is why Kuhn first began using the term "paradigm": to explain how scientists are taught and what they do, and to work out what it is that scientists within a discipline do share if they don't share rules on how to proceed.

So, Kuhn thinks it's crucial to distinguish between rules and paradigms.

A question for you: What is the difference between a rule and a paradigm (in the sense of "exemplar")? I don't think it's altogether obvious what is meant by "rule" or what the difference is between following a rule and being guided by a model, but I think Kuhn is right to try to make the distinction. And over the next several days I'll be posting some passages from Kuhn that may be useful in this regard. E.g., he says that if we could clearly answer the question "Similar with respect to what?" we wouldn't need the notion of paradigms, since the answer itself would be a rule. So a difference between an example and a rule could be, for instance, the difference between "Here's a swan, and other swans are similar to it" (an example) and "All swans are white" (a rule). And here we have to distinguish between a rule about swans and a mere fact about swans that so far seems to be true. In any event, Kuhn doesn't think you get enough of those rules/facts to let you dispense with paradigms.

I'm posting further elaborations and questions in the comments thread, and I may also post further passages from Kuhn there, if they become relevant to the discussion (assuming there is a discussion); if not, I'll give them their own separate posts in the hopes that they'll launch their own comment threads.
From: [identity profile] dubdobdee.livejournal.com
i want to come back to the "limiting geometry" problem, nonetheless, at some point -- because i don't think it's an issue that can be indefinitely postponed (incommensurability means there are measuring problems rulers are no help with <-- this is an issue of "limiting geometry")

this is not to say that "rules" is at all good word for the thing i am trying to describe

Re: Are puzzle-solutions the only exemplars?

Date: 2009-02-20 11:09 am (UTC)
From: [identity profile] dubdobdee.livejournal.com
i can sorta kinda imagine an aristotelian tutor (in the middle ages say) setting exercises for his pupils, which require them to establish which of the following [insert list of situations] is an example of MOTION (by aristotle's definition) and which is an example of something other than motion

so while as you've stated it it doesn't seem like a "puzzle solution", it could be presented in the form of one, for pedagogic purposes

(but in fact there's possibly something a bit ahistorical about doing this, as the puzzle-solution system of pedagogy may not have been the aristotelian practice -- i have no idea, and anyway the aristotelian "era" lasted more than a millennium, so may have encompassed a whole slew of different teaching fashions...)

Date: 2009-02-18 07:34 pm (UTC)
From: [identity profile] petronia.livejournal.com
I'll be getting back into this with my reading week coming up, but just wanted to point out that [livejournal.com profile] tarigwaemir (actual working biologist) got around to reading it and posted some of her thoughts here.

rules and paradigms

Date: 2009-02-19 05:22 pm (UTC)
From: [identity profile] dubdobdee.livejournal.com
i don't know if this analogy will work, but if we replace science with classical piano playing, then a PARADIGM is more like a finger exercise -- be it scales or arpeggios or less easily named formalised shapes -- which are designed (among other things) to get the fingers to deliver certain moves (the routine bulk of moves, in fact) at speed and accurately, as second nature, whereas RULES would be more like the rules of harmony, which explain how a composition goes in one direction rather than another, but are not especially relevant to learning how to PLAY the composition

when you first started discussing exemplars -- and were a bit down on the word as expressive language -- i was wondering how much its usefulness was in pointing towards the phrase "exemplary behaviour": how much did it intend to suggest that the role (in science) of an exemplar is the moulding of scientific behaviour -- not least, making certain leaps of intuition or connection or association second nature in the right contexts (and then finding out by exploration what contexts turned out to be "right" in this, or similar senses)

(if we go back to my analogy with board games, there's clearly a distinction between the rules of chess -- which ensure it's chess rather than checkers -- and the developments of tactics and strategy, which plainly fall into categories and types that you could call "rules", or at least rules of thumb, in respect of winning; but are obviously a very different type of rule

Re: rules and paradigms

Date: 2009-02-20 10:45 am (UTC)
From: [identity profile] dubdobdee.livejournal.com
finger exercises
i think you're right here -- i didn't really get set them until towards the very end of my piano lessons (only a few months before i left school and no longer had lessons), and was remiss myself in actually doing them; i suspect "modern kids" are let off them somewhat, as they are repetitive and off-putting... BUT my sense now is that they are kind of key to getting the necessary toolkit of small moves into your muscle-memory (and yes, it's a lot more than just scales, which are as much about finger-strengthening as anything; transposition exercises, all kinds of chord and arpeggio exercises)... the effect is to free up your brain from having to puzzle out where to put yr fingers, so you can concentrate on more "musical" elements of expression, and yr fingers go to the right places of their own accord

rules of harmony
very VERY roughly speaking, the baroque-classical period (c.1650-1800) was one where harmony was taught as if it followed very strict rules (and these didn't change much); within this time, there were playful or experimental composers, though they were in a minority really -- haydn probably the best-known -- who used this strictness as a field to play games with expectations; in the romantic era, which begins with beethoven, your "what you can get away with" becomes more the general sensibility -- though my guess is that the rules of the earlier period were still taught as if they were rules (that had formerly applied) and that you couldn't be an effective romantic until you'd internalised them... this began to break down in the second half of the 19th century, when for example wagner, who was often mocked by enemies for "not knowing the rules properly" very evidently established himself as a figure to admire and imitate

in the books i learnt how to harmonise from (the ones i still have) the manual on counterpoint -- which is a baroque discipline -- explicit refers to the rules in chapter headings; whereas the book on chordal harmonisation refers to them as "'rules'", as if to disavow the term, and states in the introduction that treating them as rules makes for arid music... the latter was a 1960s publication; the former first published in the 1930s

Re: rules and paradigms

Date: 2009-02-20 10:52 am (UTC)
From: [identity profile] dubdobdee.livejournal.com
there's an excellent -- very funny -- book by imre lakatos, set in the form of a play, on the story of the evolution of rules and laws and naming in what used to be called "solid geometry": ie cubes and cones and etc

basically the characters are trying to establish a law (or laws) for the equation of relationship between edges, faces and vertices, and get into all kinds of fights and exasperation, as more and more peculiar-shaped objects are introduced into play, as examples and counter-examples...

it's called "proofs and refutations" and i TOTALLY recommend it, it's one of my favourite books

Re: rules and paradigms

Date: 2009-02-20 10:59 am (UTC)
From: [identity profile] dubdobdee.livejournal.com
well again it seems to me that players probably get to be good by considering chess exercises -- there's a very well-established literature on end-game play, for example -- so that strategy and tactics for openings and mid-game had better factor in the sensibility that's been internalised via the endgame exercises

(of course PART of what exercises do is help players to imagine moves -- some way ahead -- in their heads; ie they don't have to scamper off to the next room and get out their little travelling chess-set... indeed, this is very likely AGAINST TOURNAMENT RULES)

so in this sense the distinction between paradigms and rules is that the paradigm is the exercise (whereas the rules are the rules the exercise establishes, which may or may entirely accord with the rules of chess) (the rules of chess start the game at the beginning; the rules of endgame exercises don't, obviously)

ooops no

Date: 2009-02-21 10:28 am (UTC)
From: [identity profile] dubdobdee.livejournal.com
no, it was poor wordchoice: all i meant was that at the outset of the exercise, there may be specific instructions set out for the compeletion of the exercise -- eg the rules of a chess exercise are (i) the same as ordinary chess (rook moves like this, bishop like that), except for (ii) the rule about the starting position (which in the exercise is instead as per the layout of pieces in the exercise diagram); thus by my -- not-very-well-chosen -- terminology, this particular exercise "establishes" this particular start-point as a "rule" (you're not intended, for the purposes of the exercise, to be spending your time speculating how the game reached the starting position of the exercise)

so "rules" in this case are something like "instructions for performing the exercise correctly" -- with the belief that performed most correctly, the exercise is most useful in inculcating chessmaster-like thinking

using the same terminology, "established rules" in the case of scientific puzzle-solutions possibly take the form of instructions which begin "assume for the sake of this exercise, that [x] always takes the value [y]"; they are initial conditions to ensure that the puzzle-solution doesn't sputter off in some distractive and (at this point) unhelpful direction <--- i don't think it's wrong to think of THESE as rules (or the rules of chess as rules), but maybe a better term is initial conditions... the initial conditions of chess are what tell us we're playing chess instead of halma (or some personalised chess-halma hybrid); the initial conditions of any given exercise are apllied during that exercise then discarded and forgotten

Re: rules and paradigms

Date: 2009-02-21 10:44 am (UTC)
From: [identity profile] dubdobdee.livejournal.com
if we wanted to identify "rules" - in the chessplay/chess exercise sense -- here, i think i would argue that they are more like these -- viz instructions for most correct and useful performance of the exercise:

rule 1: once you have identified the force, refer to it (in any algebraic equations that arise) as F (F1, F2 etc, if there are more than one); refer to the mass as m (m, m2 etc); call acceleration a (a1 etc)

these are habits of algebraic hygiene which will (it is hoped) enhance clarity speed and communication (with others and indeed with self in two days time) -- all of which will surely help the student's general development -- but none of these habits in themselves help her get to grips with the specific "law" at issue (viz F=ma)

if the paradigm is the puzzle-solution (or class of puzzle solutions), the "rules" in this instance would be initial conditions of advisory practice -- possibly particular to specific teachers ("only write on one side of the paper") -- which would not necessarily even carry over to the next puzzle (or semester, or professor)



meta-wail

Date: 2009-02-22 12:32 pm (UTC)
From: [identity profile] dubdobdee.livejournal.com
what i feel torn between here, tactically, is (A) not posting AT ALL until i have the time and space to do the all the (non-tired) (re)reading, as per my notation of the essay (which could take weeks and which -- without a bit of check-in stimulus and interim activity -- i will very likely drift off from, distracted), where i might have a chance of answering the questions you're asking in the form they're being asked

OR (B) continuing to post as above, in a obviously half-distracted unsatisfactory way as a result, largely, of skim-reading in snatched moments, to at least ensure that (i) someone other than you is here AT ALL and (ii) i am at least in a small sense digging away at things to keep my mind attached to your project as it unfolds... i am after all now weeks behind with the original homework, let alone any new development about to go up

my fear is that (B), my usual ticcy habit, actually seriously cuts against (A): that i very much use small diversionary discussions as a tactic to avoid declaring myself on the germane questions, but that at the same time i use the scale of (A) to enlarge the idea of (A) itself -- there's always a reason to do something urgent but unrelated (like haha earn a living) rather than get down and Master the Entire Topic in One Go and Amaze the World, and meanwhile, the more i know, the large the Entire Topic somehow gets

(normal non-wailing service will now be resumed)

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Frank Kogan

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